Phenomenological model of longitudinal spin fluctuations in itinerant antiferromagnets

TitlePhenomenological model of longitudinal spin fluctuations in itinerant antiferromagnets
Publication TypeJournal Article
Year of Publication2010
AuthorsSolontsov A, Antropov VP
Journal TitlePhysical Review B
Volume81
Pages104403
Date Published03/01
ISBN Number1098-0121
Accession NumberISI:000276248700065
Keywordscritical dynamics, electron ferromagnets, excitations, magnetic fluctuations, t-c
Abstract

We present the phenomenological analysis of the spectrum of longitudinal spin fluctuations in isotropic itinerant electron antiferromagnets with account of spin anharmonicity giving rise to coupling of transverse and longitudinal normal modes. The spectrum consists of a quasielastic part forming a central peak or a dip, depending on temperature and the Landau relaxation rate. Effects of spin-fluctuation coupling also give rise to an inelastic part of the spectrum which has a form of resonances or antiresonances near the magnon frequencies related to nonpropagating longitudinal excitations.

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